Given the givens, I'm sure it's the most recent weird troll. This person is hell bent on getting a rise out of the community for whatever reason (probably REALLY bored during quarantine and hasn't discovered Twitter yet), and the more attention we pay to him the more he's going to do it.
Take his weapons away with the realization that nothing he says is sincere or a genuinely held belief, and he is specifically saying things like "I would have changed if you'd talked nice to me" as part of the spiel. Don't give him your regard, your guilt, or your consideration. He is weaponizing your compassion to make an impact. Stop it.
ETA: This talks about this sort of pattern of behavior:
https://rationalwiki.org/wiki/Concern_troll